Concrete and Water: What You Should Know
Yes, concrete absorbs water. It’s a porous material, meaning tiny holes let water in. If water gets deep enough, it can cause cracks, wear, and other damage. That’s why it’s important to understand how concrete reacts to moisture and what you can do to stop it.
Whether you’re building in Columbus or Tupelo, MS, knowing how to protect concrete from water damage helps save time and money.
Why Does Concrete Absorb Water?
Water enters concrete through pores—small openings in the material. These pores allow rain, humidity, and even leaks to soak in. Over time, this can break down your surface. Here are the common ways water sneaks into concrete:
- Humidity: Moist air gets pulled into the concrete.
- Rain and snow: Surface water soaks in, especially when left standing.
- Leaks: Broken pipes or drains can push water under or around concrete slabs.
- Freeze and thaw cycles: In winter, water freezes, expands, and cracks the surface.
- Groundwater: Water rising from the ground puts pressure on concrete from below.
What Is Concrete Permeability?
Permeability means how fast water passes through a material. Concrete with high permeability lets water in quickly. That can lead to damage, especially on driveways, sidewalks, or building foundations.
What Affects Concrete’s Porosity?
Several factors impact how much water your concrete will absorb:
1. Water-Cement Ratio
Less water in the mix makes stronger concrete. Most good mixes use 40% to 60% water compared to cement. This lowers permeability and builds a tighter surface.
2. Size of the Aggregates
Aggregates like gravel, stone, or sand are mixed into concrete. Bigger pieces leave more open spaces. Smaller pieces, like sand, pack tighter and reduce porosity.
3. Curing Time
Concrete needs time to cure or harden. If it cures too fast, pores stay open and water gets in. A cure time of 7 to 14 days helps the surface seal up properly.
How to Stop Water From Getting In
Even though concrete absorbs water, you can still protect it. Here’s how:
- Use less water in the mix for stronger concrete.
- Compact it well so there are fewer air gaps.
- Seal the surface with a coating or crack sealer.
- Check your drainage and fix issues quickly.
Our team in Tupelo and Columbus uses these steps to keep concrete surfaces protected for the long haul.
What Happens When Water Gets In?
Water in your concrete can cause long-term problems, including:
Cracking and Spalling
Water wears down the material. It starts with small cracks. Then pieces flake off the top, which leads to even more water damage.
Rust and Corrosion
Concrete often holds steel rebar for support. If water reaches the steel, it can rust. That rust expands and cracks the concrete from the inside.
Mold and Mildew
When it’s warm and wet, mold and mildew grow on concrete. That’s not just ugly—it can become a health hazard too.
Weak Structure
If concrete isn’t cured right or was made with too much water, it won’t be strong enough to last. Proper curing and expert mixing are key to long-term strength.
Work With a Contractor You Can Trust
At Phillips Contracting, we help you pour and maintain high-quality concrete in Columbus and Tupelo, Mississippi. We use the right mix, the best curing methods, and proven waterproofing techniques to help you avoid concrete water damage.
Need help with your next project? Contact us today! Let’s build something strong—together.
